D.C. Mun. Regs. tit. 31, § 1003
1003.1 Each application (including a renewal application for a hacker's license) shall be accompanied by a certificate from a physician who is a resident of the Metropolitan Area, certifying that, in the opinion of that physician, the applicant is not afflicted with any disease or infirmity which might make him or her an unsafe or unsatisfactory driver of a public vehicle.
1003.2 The form of the physician's certificate shall be prescribed by the Chairperson and shall provide for any additional information relating to the applicant's past or present medical history as the Chairperson may consider necessary.
1003.3 The certificate shall be executed by the certifying physician within thirty (30) days of the date of filing of the application.
1003.4 Each application (including a renewal application) shall also be accompanied by a certificate signed by the applicant on a form prescribed by the Chairperson certifying that, to the best of the applicant's knowledge and belief, he or she has no disease or disability which would render him or her unsafe or unsatisfactory as a driver of a public vehicle. The form may provide for additional information relating to the applicant's past or present medical history or condition.
1003.5 Each applicant shall have central visual acuity of at least 20/40 in one eye, either unassisted or assisted by glasses or contact lens, and shall have hearing of at least 10/20 in one ear.
1003.6 No applicant shall be considered for a license if, at the time the application is filed, the applicant is suffering from a contagious disease, epilepsy, vertigo, fainting spells, blackouts, attacks of dizziness, or other medical condition that in the opinion of the Chairperson may render the applicant unsafe or unsatisfactory as a driver of a public vehicle.
SOURCE: Regulation No. 72-13, approved June 30, 1972, 19 DCR 61 (July 24, 1972), 32 DCRR §§ 10.203, 10.204 and 10.205, Special Edition; as amended by Final Rulemaking published by 34 DCR 6704 (October 23, 1987).